US5374335A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sized paper, process for producing same and use thereof
Assignee: Nouryon Pulp and Performance Chemicals AB
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Filing: 1993-11-01
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Granted: 1994-12-20
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Expires: 2013-11-01
Abstract
Abstract The present invention relates to a sized paper containing a hydrophobic zeolite. Suitably, the sized paper is fine paper, kraft liner or paperboard. In paperboard intended for solid or liquid foodstuffs, tobacco or medicines, use is also made of the capacity of the zeolite to reduce, by adsorption, the problem of transfer from the package to its content of substances causing undesirable taste or hazardous substances. The present invention also relates to a method for production of the sized paper by forming and dewatering a suspension of lignocellulose-containing fibres, where the dewatering is carried out in the presence of a hydrophobic zeolite. Due to the inert nature of the zeolite, it can be used in papermaking within a very broad pH range. The present invention also relates to the use of a hydrophobic zeolite for the production of sized paper as well as use of the thus-sized paper in packaging material.
Inventors
- 👤 Erik Lindgren
- 👤 Ulf Carlson
- 👤 Lennart Nilsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:35
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/63; D21H17/67; D21H17/68; D21H21/00; D21H21/14; D21H21/16; D21H23/00; D21H23/02; D21H23/04; D21H23/06; D21H23/14; D21H23/18; D21H23/76; D21H23/765
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
29 words
A sized paper of lignocellulose-containing fibers, including a hydrophobic zeolite, wherein the hydrophobicity of the zeolite characterized by the residual butanol content is below about 0.5 percent by weight.
Claim 2
Dependent Claim
29 words
A sized paper of lignocellulose-containing fibers, including a hydrophobic zeolite, wherein the hydrophobicity of the zeolite characterized by the residual butanol content is below about 0.5 percent by weight.
Claim 3
Dependent Claim
22 words
A sized paper according to claim 1, wherein the hydrophobicity of the zeolite is from 0.001 up to 0.3 percent by weight.
Claim 4
Dependent Claim
30 words
A sized paper according to claim 1, wherein the zeolite has a molar ratio of SiO 2 to Al 2 O 3 in tetrahedral coordination of at least about 10:1.
Claim 5
Dependent Claim
14 words
A sized paper according to claim 1, wherein the zeolite is a pentasil type.
Claim 6
Dependent Claim
27 words
A sized paper according to claim 1, wherein the amount of zeolite is from about 0.05 kg/ton up to about 50 kg/ton of dry fibers and filler.
Claim 7
Dependent Claim
15 words
A sized paper according to claim 1, wherein the paper contains a conventional sizing agent.
Claim 8
Dependent Claim
21 words
A sized paper according to claim 1, wherein the lignocellulose-containing fibers are recycled fibers or fibers which have been separated mechanically.
Claim 9
Independent Claim
49 words
A method for production of sized paper, comprising forming and dewatering a suspension of lignocellulose-containing fibers, wherein the dewatering is carried out in the presence of a hydrophobic zeolite, and wherein the hydrophobicity of the zeolite characterized by the residual butanol content is below about 0.5 percent by weight.
Claim 10
Independent Claim
49 words
A method for production of sized paper, comprising forming and dewatering a suspension of lignocellulose-containing fibers, wherein the dewatering is carried out in the presence of a hydrophobic zeolite, and wherein the hydrophobicity of the zeolite characterized by the residual butanol content is below about 0.5 percent by weight.
Claim 11
Dependent Claim
21 words
A method according to claim 8, wherein the hydrophobicity of the zeolite is from 0.001 up to 0.3 percent by weight.
Claim 12
Dependent Claim
29 words
A method according to claim 8, wherein the zeolite has a molar ratio of SiO 2 to Al 2 O 3 in tetrahedral coordination of at least about 10:1.
Claim 13
Dependent Claim
27 words
A method according to claim 8, wherein the amount of zeolite added is from about 0.05 kg/ton up to about 50 kg/ton of dry fibers and filler.
Claim 14
Dependent Claim
20 words
A method according to claim 8, wherein the dewatering is carried out in the presence of a conventional sizing agent.
Claim 15
Dependent Claim
25 words
A method according to claim 12, wherein the conventional sizing agent is an alkyl ketene dimer (AKD), an alkenyl succinic anhydride (ASA) or combinations thereof.
Claim 16
Dependent Claim
21 words
Method according to claim 12, wherein the zeolite is added in the form of a dispersion containing a conventional sizing agent.
Claim 17
Dependent Claim
16 words
A method according to claim 12, wherein the zeolite is added before the conventional sizing agent.
Claim 18
Dependent Claim
20 words
A method according to claim 8, wherein the zeolite is added immediately before the head box of the papermaking machine.
Claim 19
Independent Claim
34 words
A method for rendering sized paper hydrophobic, comprising incorporating in the paper a hydrophobic zeolite, wherein the hydrophobicity of the zeolite characterized by the residual butanol content is below about 0.5 percent by weight.
Claim 20
Independent Claim
34 words
A method for rendering sized paper hydrophobic, comprising incorporating in the paper a hydrophobic zeolite, wherein the hydrophobicity of the zeolite characterized by the residual butanol content is below about 0.5 percent by weight.
Claim 21
Independent Claim
42 words
A method for producing hydrophobic packaging material, comprising incorporating in sized paper a zeolite, wherein the hydrophobicity of the zeolite characterized by the residual butanol content is below about 0.5 percent by weight, and forming said packaging material from the sized paper.
Claim 22
Independent Claim
42 words
A method for producing hydrophobic packaging material, comprising incorporating in sized paper a zeolite, wherein the hydrophobicity of the zeolite characterized by the residual butanol content is below about 0.5 percent by weight, and forming said packaging material from the sized paper.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-12-19 | 1998-06-20 | 1998-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-12-19 | 2002-06-20 | 2002-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-12-19 | 2006-06-20 | 2006-12-20 | $7700.00 | Window Closed / Lapsed |